环境温度对中波红外成像设备MRTD的影响研究

Research for the influence of ambient temperature on MRTD of MWIR imaging device

MRTD是评价红外成像设备的重要技术参数,与设备的外场作用距离直接相关,因此常用来预测外场作用距离。一般军事装备的工作环境温度为-40℃(甚至更低)到+55℃的环境(依据应用场景会有所不同),在此温度范围内,由于目标辐射能量、探测器噪声、光学传函等发生变化,会引起MRTD的变化。而一般设备出厂时只检测室温MRTD,没有给出其他环境温度下的MRTD。针对以上问题,本文考虑环境温度对成像设备信号传递函数、噪声、调制传递函数等因素的影响,探究不同环境温度下MRTD的变化规律,建立不同环境温度下MRTD的关系,通过室温MRTD预测得到其他环境温度下的MRTD,提高不同环境温度下外场作用距离预测精度。

MRTD is an important technical parameter for evaluating infrared imaging equipment, which is directly related to field action distance of the equipment, and often used to predict the field action distance.The operating temperature of general military equipment is from-40 ℃(or even lower)to +55 ℃(depending on the application scenario),and within this temperature range, changes in MRTD are caused by changes in target radiation energy, detector noise, optical transmission, etc.The general equipment is only tested at the factory for room temperature MRTD,and no MRTD is given for other ambient temperatures.In order to solve the above problem, the influence of ambient temperature on the signal transfer function, noise, modulation transfer function and other factors of imaging devices is considered in this paper, the variation law of MRTD under different ambient temperatures is explored, and the relationship of MRTD under different ambient temperatures is established.MRTD under other ambient temperatures through room temperature MRTD prediction are obtained, thus the prediction accuracy of field action distance under different ambient temperatures is improved.